He has always suffered from Narcissist Personality Disorder (" is a mental condition in which people have an inflated sense of their own importance, a deep need for excessive attention and admiration, troubled relationships, and a lack of empathy for others" - Mayo Clinic). In his reality what you know are lies are truths for him. Almost anything he says is a lie because of the nature of his disorder.
Think about the two sides of reality as seen through the eyes of a marine, what did we do wrong, answered by another who realized the truth, or the egocentric arrogance of a Col, I did it and Ill do it again, who can't handle the truth of reality.
I don't believe any prosecutor would bring charges against him because of his personality disorder. Would a prosecutor charge a schizophrenic for a crime?
I suspect the best avenues of removal are either a 25th Amendment solution or impeachment. I also do not see either being implemented by Republicans. I suspect they will suck it up for the rest of his term and either hope he doesn't run in 2020 or primary him.